Means for preserving boiler-flues.



J. P. DANBROOK.

MEANS FOR PRESERVING BOILER FLUES. APPLICATION FILED APR- 27, 1914. 1 19 3500 Patented May11,1915.

16M 1 mf THE NORRIS PETERS 60., PHOTO-LITHOQ WASHINGTON, D c

JAMES PERCY DANIBROOK, 0F SALVADOR, SASKATCHEWAN, CANADA.

MEANS FOR PRESERVING BOILER-FLUES.

Specification of Letters Patent.

Patented May iii, 1915.

Application filed April 27, 1914-. Serial No. 834,654.

To all whom it may concern:

Be it known that I, JAMEs PnRcY DAN- nnoox, of the hamlet of Salvador, Province of Saskatchewan, Canada, have invented certain new and useful Improvements in Means for Preserving Boiler-Flues, of which the following is a specification.

My invention relates to improvements in means for preserving boiler fines, and the principal object of my invention is to prevent any forced draft through the fines when the fire door is open, thus preventing forced drafts of cold air being drawn through said flues, and the preferred manner of putting my invention into practice will be hereinafter particularly set forth and described, and what I claim as new will be pointed out in the claim forming part of this specification.

Figure 1 is a perspective view of a well known type of engine boiler, unmounted, showing in perspective my preferred form of invention applied thereto. Fig. 2 is a vertical cross section through the smoke box at the forward end of the boiler, showing certain valve mechanism hereinafter referred to, and Fig. 8 is a vertical longitudinal section through the three-Way valve, showing in section a portion of each pipe coupled thereto.

In the drawings like characters of refer ence indicate corresponding parts in each figure.

My invention in its broadest application can be embodied to be used with any type of boiler having fiues.

It is well known that it is the common practice to allow the exhaust steam from the engine to escape into the smoke box directly underneath the smoke stack in order that a forced draft may be had. Now it is well known that the passage of cold air through the fines, if they have been heated up, damages the same very materially, and a great advantage resulting from my invention resides in the fact that the intake ends of said fiues are not subjected to the deteriorating eifects of forced drafts of cold air passing therethrough. When the fire door is now opened by the fireman to stir the fire, a great deal of ashes is drawn by the forced draft into the flues. Now by means of my invention since there will be no forced draft through the fines when the fire door is danger of sparks being forced out of the i smoke stack. Therefore with my invention there will be no draft to cause sparks to be forced out of the smoke stack when the fire is being stirred.

A still further advantage derived from my invention resides in the fact that the spark screen (not shown) may be easily cleaned while the engine is working, without danger.

A is a suitable boiler, and B the furnace. The intake ends (not shown) of the flues 0 open from the furnace B, and lead into the smoke box D.

E is the usual pipe whereby the exhaust steam from the engine is exhausted into the smoke box through the ordinary exhaust nozzle attached to the inner end thereof which is positioned usually underneath the smoke stack F. In place of the ordinary exhaust nozzle, I use a three-way valve G,

which is provided with an exhaust nozzle H. Connected with the three-way valve G is a pipe I which projects through one side of the smoke box D and is preferably, though not essentially, provided with an elbow coupling J the discharge end of which is turned downward.

K is a lever fitted over the stem L of the valve plug 9 of the three-way valve G. In the position of the lever K illustrated in Fig. 2, since the fire door M is closed, the steam is exhausting through the nozzle H. Now in order to cut off the exhaust of steam through the nozzle II and cause it to exhaust through the pipe I when the fire door M is opened partly, or wide open, I provide the following means:

2 is a bell-crank lever pivoted by the pin or rivet 3 to the bracket i which is suitably secured to the side of the boiler.

5 is a link rod coupling the arm 6 of the lever 2 to the lever K.

7 is a link rod coupling the arm 8 of the lever 2 with the arm 9 keyed on the actuating rod 10. The upper portion of the hinges will turn the rod 10 with the result be as regards the closing of actuating rod 10 is supported in the bearing bracket 11 secured to the front wall 15, and the lower end of said rod 10 is keyed in the head 12 of the arm 13 secured to the fire door M. g

14 are the hinges whereby the fire door is swung from the wall 15 of the furnace. The axis of the rod 10 is on a line with the axes of the members a of the hinges 14. Therefore, when the fire door M is unlatohed and opened, the turning of the same on its that the arms and link rods already mentioned will shift the lever K substantially into the dotted position shown, and so move the valve plug g to cut off the exhaust from the nozzle II and cause the exhaust to pass through the pipe I and the coupling J.

Where the link rod 5 passes through the side of the smoke box, I provide a hole I) so that said link rod may have freedom of movement.

From the foregoing specification it will be clear that the various parts of my device are simple in construction and will be constructed strong'enough to withstand the ordinary rough usage they will be subjected to. The link rods 7 may be easily uncoupled from the arm 9 so that the engineer may keep the exhaust nozzle H closed as long as he wishes notwithstanding the position of the fire door M.

Many engineers are very careless in leaving the fire door open longer than is absolutely necessary, with the result that the currents of cold air being drawn through the fluesC do much damage. Now when the exhaust steam is forced to exhaust outside of the smoke box when the fireman opens the fire door M, no matter how careless he may the fire door the Copies of this patent may be obtained for five cents each, by addressing the 'ple can be embodied in flues C will be protected fromthe injurious efl ects of cold-air drafts at any and all times.

While I have described what I consider to be the best embodiment of my invention, I desire it to be understood that the princi- 7 different forms and I desire not to be limited beyond the requirementsof the prior art and the terms of my claim.

What I claim as my invention is:

In combination with a boiler having a smoke box and "furnace, said furnace provided with a fire door; the fines opening from said furnace into the smoke box; an exhaust pipe opening into said smoke box,

a three-way valve coupled to the inner end of said exhaust pipe, and provided with an exhaust nozzle; a coupling pipe connected with said three-way valve and opening through the smoke box into'the air; a lever controlling the movement "of said valve which is normally positioned to permit the steam to exhaust through said nozzle; a bellcrank lever carried by said boiler; a link rod connecting said bell-crank lever with said first-mentioned lever; an actuating rod supported by the furnace, and having its axis in alinement with'the axis'of movement of said fire door; means whereby the lower end of said actuating rod is connected with said fire-door; an arm carried by the upper end of said actuating rod, and a link rod connecting said arm with said bell-crank lever, the whole arranged to operate as set forth. In testimony whereof I have affixed my signature in presence of two witnesses.

JAMES PERCY DANBROOK.

"Witnesses:

A. R. BUCHANAN, W. D. C. MoOARrY.

Commissioner of Patents, 

